1001210010021 has 16 divisors (see below), whose sum is σ = 1597372096320. Its totient is φ = 616129236720.

The previous prime is 1001210010013. The next prime is 1001210010079. The reversal of 1001210010021 is 1200100121001.

It is a happy number.

It is not a de Polignac number, because 1001210010021 - 2³ = 1001210010013 is a prime.

It is a super-3 number, since 3×1001210010021³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1001210009985 and 1001210010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001210010011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1426224735 + ... + 1426225436.

It is an arithmetic number, because the mean of its divisors is an integer number (99835756020).

Almost surely, 2^{1001210010021} is an apocalyptic number.

It is an amenable number.

1001210010021 is a deficient number, since it is larger than the sum of its proper divisors (596162086299).

1001210010021 is a wasteful number, since it uses less digits than its factorization.

1001210010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2852450193 (or 2852450187 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1001210010021 its reverse (1200100121001), we get a palindrome (2201310131022).

The spelling of 1001210010021 in words is "one trillion, one billion, two hundred ten million, ten thousand, twenty-one".